Question about Brother MFC 420CN All-In-One InkJet Printer

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Will not print black

How do I clean a clogged print head? My faxes come out in a purple color, but when I try to print of my computer nothing that is black shows up. I the problem is where the ink is dispensed into the printer itself not the cartridge. Is there any way to flush it out if it already clogged or dry? What can I do?

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Re: will not print black

The ph will be cleaned by pressing ink thru the system (tubes and ph). Do use only dye-ink for this procedure. The best way is to use original brother ink.
place a new cart into position and make sure that they are secured.

press menu then start bk copy then fortimes arrow up. machine will be in maintenance mode. press 7 then 6 then 4 then start bk copy. machine will refresh ink and do some cleaning. afterwards press 7 then 6 then 3 then start bk copy. machine will do a power purge. when finished press 9 then 9 to leave the maintenance mode. do run a test quality print by pressing ink etc.. If you cant see any bk the ph is defenetly clogged and cant be fixed anymore. It needs replacing.

Posted on Dec 14, 2007

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You might have to run the head clean more than once - if no black at all is printing.. Alternatively, set out a page of all black (background) and print few pages on high print quality setting.

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If you do not get an error in the LCD screen, it usually means that your Print head is clogged: try running a couple cleaning cycles using your printer inbuilt utility to try to 'clean' the Print head.
If this does not clear the clog head, try using a new original Brother black cartridge (which contains special solvent to prevent clogging) and repeat the cleaning cycles a couple times again.
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1 Answer

Don't print the black color

Doing reference on your issue. Double check the ink cartridge to make sure that the cartridge is correctly installed. Also be sure that the black ink cartridge used is compatible with the machine.

The next thing to do is a cartridge cleaning as the belief is that the print head is blocked. If you have done a thurough cleaning, the next thing to do is replace the black ink cartridge to be certain the ink cartridge is not faulty.

I have included print head cleaning instructions in case you have not done this cleaning process.

here is some information from the Brother support site:

If one or more of the ink colors are missing from pages printed by your machine (i.e. received faxes, copies and/or documents printed from the PC etc), nozzles in the print head may be clogged, or the ink cartridge in question may not be installed correctly. Verifying that the ink cartridges are installed correctly and/or cleaning the print head may solve the problem.

Cleaning the print head may solve the problem. When cleaning the print head, you are given the option to clean BLACK ONLY, one of the three colors (CYAN, YELLOW, or MAGENTA), or all four colors at once. For this issue we recommend cleaning only the affected color. If more than one color is missing then choose ALL.

When the machine completes cleaning the print head, press Color Start. A Print Quality Check Sheet will print.


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1 Answer

Color differences

i apologize for the inconvinience.

the possible reason why its printing the right color, is bec. some of the nozzles might be clogged by dried inks, so when inks come out, the combination of colors are not balance. try printing a nozzle check first, if the nozzle check have gaps or breaks, try head cleaning, nozzle check after it so you can see if it improve or still w/ gaps, just do nozzle check, head cleaning, then nozzle check, head cleaning alternately until no more gaps then try to print.

Printing a nozzle check pattern
Load paper in your printer
In SelecType mode, press the Paper Feed (fontu1.gif) or Paper Feed (fontd1.gif) button until TEST PRINT is displayed on the LCD panel, and then press the SelecType button.
Press Paper Feed (fontu1.gif) or Paper Feed (fontd1.gif) button to display NOZZLE CHECK
Press SelecType button to display PRINT
Press the Enter button. The nozzle check pattern is printed as shown below. After printing, printer exits the SelecType mode and return to the READY status.
Nozzle check pattern examples:
yoi.gif head cleaning necessary

headcleaning: press the cleaning button for 3 seconds

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I have recently bought new ink for my brother mfc 255cw. While it was running low ink, it would print out copies colored purple. even though I have already purchased and replaced all the ink cartridges, it...

I would suspect your inkjets are blocked Black and blue =purple so the other colors are blocked up Use the nozzle cleaning function to try and remove the clog Run nozzle check after cleaning mode till all colors print correctly

Please rate my help++++Thanks for using FIXYA

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1 Answer

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Your yellow cartridge is probably not working as your photos suggest. Remove and reinsert the yellow cartridge. Try printing only yellow color.
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I was working on the Pixma mx850 for 3 weeks now. I have found that you need to reset the using back to factory default. On the display look for the "printer head" cleaning and alignment. Go through the steps that it gives you for printer head cleaning. Print a test page. have you tried to copy in "black/whte" and not color? that will use the large black and not the small black cartrdge. Try a couple of black circles in "paint" if your running windows XP. make a test page of your own and print it.

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I sounds that the black printhead inside your printer is clogged. Please try head cleaning on the printer. Regardless of what brand name you using you can actually check it on your computer. Check on the example below:

click on start / settings / printers & faxes then right click on the printer icon left click on printing preferences

Click on maintenance tab and you will see cleaning button


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Sounds to me your print head is plugged up. This is not usual though because the majority of people use black ink much more. So, in your printer utility, do a deep cleaning. If that does not work, there is a thing called a purge unit in it. This is a usual way of draining waste ink to a pad that soaks it up. if the hose, or other parts are clogged, it backs the ink up and causes the print head to clog. If this is the start of it, do not waste your ink cleaning, and try not to let it sit too long. Contact canon, and let them kno what you think it is.

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